Valheim already has its own sort of magic with the forsaken powers you get from each boss, but if you're more into to slinging fireballs around you may want to try out Skyheim. This mod adds runes that you can craft with loot from bosses and dungeons. Summon a light instead of carrying a torch. Scorch a forest full of Greylings with your fire. Oh, and teleport yourself back to your bed at will. It sounds pretty powerful, but chucking fire and ice around sure looks like a good time.